A production process equipment for three-sided ribbed threaded steel bar

Abstract

A production technology for a screw-thread steel bar with three ribbed sides comprises a pretreatment working procedure (1), a roughing rolling unit (3), a first shearing device (5), an intermediate rolling unit (6), a second shearing device (8), a finishing rolling unit (9), a third shearing device (11), a reducing sizing mill unit (12), a fourth shearing device (14) and a post treatment working procedure (15) sequentially, wherein the roughing rolling unit (3), the intermediate rolling unit (6), the finishing rolling unit (9) and the reducing sizing mill unit (12) are all three-roller rolling mills. Crescent-shaped grooves matching the rib portions of the steel bar surface are engraved in the roller faces of the last three-roller rolling mill of the finishing rolling unit (9). According to the production technology, the high-strength three-roller rolling mills are arranged on the whole line to enable a large rolling power, and guarantees are provided for fine grain steel bar production in a controlled rolling and cooling mode under large single-pass pressure; in addition, orderly production of the novel screw-thread steel bar with the high-strength grade can be achieved by arranging temperature control water tanks at multiple positions on the whole line, on-line temperature control cooling the rolled pieces through media such as water and gas, and adopting a reasonable rolled piece temperature window in cooperation with the large-pressure technology of the rolling mills.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a production process equipment for three-side ribbed threaded steel bars. Background technique [0002] Adopting two-roll mill to roll out the threaded steel bar with ribs on both sides is the known technology of threaded steel rolling production. [0003] With the progress and development of the country, large-scale infrastructure and urbanization construction cannot do without threaded steel bars for construction. In 2013, the output of threaded steel bars has exceeded 200 million tons, accounting for 20% of my country's steel production capacity. National competent authorities have also successively issued relevant policies to accelerate the elimination of 335MPa grade steel bars in construction projects, give priority to the use of 400MPa grade steel bars, and actively promote 500MPa grade steel bars. [0004] While gradually increasing the strength leve...

AI Technical Summary

Problems solved by technology

[0005] However, the existing threaded steel bars are ribbed on both sides from the cross section, while the other two sides are not ribbed.

When the building is subjected to external forces from multiple directions, the bonding degree between the non-ribbed surface of the steel bar and the concrete is not tight, and it is easy to fall off after being stressed. In addition, the strength level of the existing threaded steel bar is low, which in turn creates a safety hazard for the building

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